If I had a feature I wanted to put in, I would just fork your project and add it, right? Then your project (presumably with out that feature) would be competing

If I had a feature I wanted to put in, I would just fork your project and add it, right? Then your project (presumably with out that feature) would be competing with mine, but each time you added another release I can just merge it into mine, but you won't do that? If so, don't you see yourself getting outcompeteted by forks?